Duplicate items in legend in matplotlib?
user2881553
I am trying to add the legend to my plot with this snippet:
import matplotlib.pylab as plt
fig = plt.figure()
axes = fig.add_axes([0.1, 0.1, 0.8, 0.8]) # left, bottom, width, height (range 0 to 1)
axes.set_xlabel('x (m)')
axes.set_ylabel('y (m)')
for i, representative in enumerate(representatives):
axes.plot([e[0] for e in representative], [e[1] for e in representative], color='b', label='Representatives')
axes.scatter([e[0] for e in intersections], [e[1] for e in intersections], color='r', label='Intersections')
axes.legend()
I end up with this plot
Obviously, the items are duplicated in the plot. How can I correct this error?
DSM
As the docs say, although it's easy to miss:
If label attribute is empty string or starts with “_”, those artists will be ignored.
So if I'm plotting similar lines in a loop and I only want one example line in the legend, I usually do something like
ax.plot(x, y, label="Representatives" if i == 0 else "")
where i is my loop index.
It's not quite as nice to look at as building them separately, but often I want to keep the label logic as close to the line drawing as possible.
(Note that the matplotlib developers themselves tend to use "_nolegend_" to be explicit.)
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